// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/blink/web_scrollbar_layer_impl.h"

#include <utility>

#include "base/memory/ptr_util.h"
#include "cc/blink/scrollbar_impl.h"
#include "cc/blink/web_layer_impl.h"
#include "cc/layers/layer.h"
#include "cc/layers/painted_scrollbar_layer.h"
#include "cc/layers/scrollbar_layer_interface.h"
#include "cc/layers/solid_color_scrollbar_layer.h"

using cc::PaintedScrollbarLayer;
using cc::SolidColorScrollbarLayer;

namespace {

cc::ScrollbarOrientation ConvertOrientation(
    blink::WebScrollbar::Orientation orientation)
{
    return orientation == blink::WebScrollbar::Horizontal ? cc::HORIZONTAL
                                                          : cc::VERTICAL;
}

} // namespace

namespace cc_blink {

WebScrollbarLayerImpl::WebScrollbarLayerImpl(
    std::unique_ptr<blink::WebScrollbar> scrollbar,
    blink::WebScrollbarThemePainter painter,
    std::unique_ptr<blink::WebScrollbarThemeGeometry> geometry)
    : layer_(new WebLayerImpl(PaintedScrollbarLayer::Create(
        base::MakeUnique<ScrollbarImpl>(std::move(scrollbar),
            painter,
            std::move(geometry)),
        0)))
{
}

WebScrollbarLayerImpl::WebScrollbarLayerImpl(
    blink::WebScrollbar::Orientation orientation,
    int thumb_thickness,
    int track_start,
    bool is_left_side_vertical_scrollbar)
    : layer_(new WebLayerImpl(
        SolidColorScrollbarLayer::Create(ConvertOrientation(orientation),
            thumb_thickness,
            track_start,
            is_left_side_vertical_scrollbar,
            0)))
{
}

WebScrollbarLayerImpl::~WebScrollbarLayerImpl()
{
}

blink::WebLayer* WebScrollbarLayerImpl::layer()
{
    return layer_.get();
}

void WebScrollbarLayerImpl::setScrollLayer(blink::WebLayer* layer)
{
    cc::Layer* scroll_layer = layer ? static_cast<WebLayerImpl*>(layer)->layer() : 0;
    layer_->layer()->ToScrollbarLayer()->SetScrollLayer(
        scroll_layer ? scroll_layer->id() : cc::Layer::INVALID_ID);
}

} // namespace cc_blink
